@Aashish when launched the ultrasonic fingerprint it had came with a bug by which the ultrasonic scanner used to scan the micro cracks and scratches on the screen guard not the actual fingerprint print and by some trick it can be unlocked by any one and later Samsung had issue warning regarding the bug...
that's not a bug that's the fault with .. our traces on screen guard or cover on the screen gets scanned . ultrasonic only advantage over other fingerprint scanner is that it doesn't take a photo of your fingerprint but scans you prints using ultrasonic sound.....- so you can use it even when phone is locked...
The best fingerprint scanner is Apple's iPhone fingerprint scanner which would only scan your finger only if blood flows in it ....it means you can't unlock it by killing a person. (unbiased opinion) Samsung physical fingerprint scanner is also good but ultrasonic is a downgrade .
